ASSM – Automatic Segment Space Management – feature that controls how space in a segment is allocated, used and reused. Does away with the need to manually manage settings for FREELISTS, FREELIST GROUPS and PCTUSED (set at a tablespace level). There’s not much comprehensive documentation on it online, almost implying that it’s a no-brainer a bit like LMTs. However, there are always exceptions and there are some articles out there that suggest ASSM as an OLTP only solutions – i.e. not Data Warehouse – and also mention issues for very high-end OLTP sites.